/ Instrumentation

Development of the ultra-low background HPGe spectrometer OBELIX at Modane underground laboratory

Brudanin, V.B. (Dubna, JINR) ; Egorov, V.G. (Dubna, JINR) ; Hodák, R. (IEAP CTU, Prague) ; Klimenko, A.A. (Dubna, JINR) ; Loaiza, P. (Modane, Lab. Souterrain) ; Mamedov, F. (IEAP CTU, Prague) ; Piquemal, F. (Modane, Lab. Souterrain) ; Rukhadze, E. (IEAP CTU, Prague) ; Rukhadze, N. (Dubna, JINR) ; Štekl, I. (IEAP CTU, Prague) ; Shitov, Yu.A. (Dubna, JINR) ; Warot, G. (Modane, Lab. Souterrain) ; Yakushev, E.A. (IEAP CTU, Prague) ; Zampaolo, M. (Modane, Lab. Souterrain)

Published in: JINST
Year: 2017
Vol.: 12    Num./Issue: 02
Page No: P02004
Year: 2017-02-03 published

Abstract: A new ultra low-background spectrometer based on a HPGe detector with a sensitive volume of 600 cm(3) was developed to investigate rare nuclear processes, such as resonant neutrino-less double electron capture (0νEC/EC) and double beta decay processes (2ν2β(−), 2νβ(+)EC, 2νEC/EC) to the excited states of daughter nuclei. The spectrometer was installed at the Modane underground laboratory (LSM, France, 4800 m w.e.). Sensitivity of the spectrometer and its background were tested. A new method for the efficiency calibration in measurements of low-active samples was developed. The spectrometer was used for the measurements of low active materials and samples. Results obtained in 395 h investigation of resonant 0νEC/EC decay of (106)Cd to the 2718 keV and 2741 keV excited states of (106)Pd with ~23.2 g of enriched (106)Cd and 2ν2β(−) decay of (100)Mo sample with a mass of 2588 g to the 0(+), 1130 keV and 2(+), 539.5 keV excited states of (100)Ru are presented.

Total numbers of views: 293
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DOI: 10.1088/1748-0221/12/02/P02004
 Record created 2017-03-02, last modified 2017-03-02

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